Sorry I don,t have any Pics of the Carb,I was as baffled as you.I pulled it off a year ago and had it rebuilt,A Holley 4150 complete rebuild kit was used and worked fine.I went to install it with a square bore base gasket the bolt pattern did,nt match up.I determined it was a Dominator bolt pattern,I called the company that built the carb 7 years ago.Bigs Performance Products.Bigs told me the the base was a Dominator base and the gasket was no longer availible. the only thing I can do is match a Square Bore Gasket and modify the bolt holes.My question was will a thin open gasket work with a 4 hole spacer?